Gear shift knob



FIG. 1 is a front elevational view of the gear shift knob showing my new design;

FIG. 2 is a frontal right-side perspective view thereof; and,

FIG. 3 is a frontal left-side perspective view thereof.

The broken line showings of the center console and the gear shift indicators are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a gear shift knob, as shown and described. 